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Control of liquid level is an important and common task in any process industry. In this work, control of liquid level in a conical tank (nonlinear in nature) with an actuator problem is studied. Proportional – Integral (PI) controller is the commonly designed linear controller for controlling liquid level in process industries. Since, the problem is nonlinear in nature, an improvement in the tuning of parameters of the PI controller is resorted. This work deals with the different methods to control the liquid level in the conical tank, viz., weighted PI controller, fuzzy weighted PI controller and neuro fuzzy tuned PI controller and are compared with traditional PI controller. Real time experimental studies are carried out for all the controllers to evaluate their performances in the control of the liquid level of a conical tank. The performance is evaluated based on a loss function namely, cumulative squared error.

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